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Description
In new-generation electron-positron colliders based on the crab-waist collision scheme, a limited dynamic aperture poses a common challenge, largely attributable to interplay between the crab sextupoles and the nonlinearity of the intervening magnets. Nonlinear contributions from the kinetic terms in the final drift, the fringe fields of the final doublets, and the chromaticity-correction sextupoles are known to strongly influence lattice design in circular $e^+e^-$ storage rings. Beyond these sources, beam–beam interactions can also play a significant role. In particular, the beam–beam tune shift induced by colliding bunches can distort the nonlinear cancellation between crab-sextupole pairs, thereby introducing additional nonlinear perturbations. This study investigates the impact of beam-beam effects on the lattice dynamics of the Super Tau-Charm Facility(STCF) and presents dedicated compensation strategies. Furthermore, we analyze the evolution of the beam and luminosity under the combined influence of the lattice and beam-beam effects for both the original and the compensated lattice.
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